Graph view option to crop runahead tasks.
Check default runahead limit being enforced.
Add special task testing for sequential and one-off tasks.
Graph view: also crop tasks held beyond final cycle time.
Merge remote branch 'upstream/master' into expand-battery-8
Merge remote branch 'upstream/master' into expand-battery-8
Added testing for special tasks.
Tidy.
gcylc back compat for new err log functionality.
More gcylc backward compatibility with 5.3.0 suites.
Merge branch 'master' into graph-view-runahead
Review tweaks.
Merge pull request #767 from arjclark/expand-battery-8

Expand battery 8
Merge pull request #763 from hjoliver/graph-view-runahead

Graph view option to crop runahead tasks.